<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		
		<script>
			var num1 = 20;
			var num2 = 30;
			// + * 就是运算符
			var result = num1 + num2;
			var result = num1 * num2;
			var flag = num1 > num2; //false
			
			// true && false
			
			var str1 = "Hello";
			var str2 = "World";
			var message = str1 + str2;
			
		</script>
	</body>
</html>
